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Constraints | Written By | Append Date |
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Made out of aluminum (0.064in for bent aluminum) |
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Machinable |
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Utilizes Countersunk Holes for Tripod Interference (Ensure Screw Head and Baseplate thickness is adequate) OR Utilizes tapped holes in baseplate (Ensure screw length is adequate) |
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Adheres to Servo Gearbox Dimensions |
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Assignees
Assignee | Asana Task | Date |
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Let me know more! Thanks!!
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Author: Alison Thompson Date:
CAD Review:
I like the green version, but I think the thickness of the baseplate can be knocked back down a decent bit, you do need to be thicker than the bolt head plus a bit, but not this thick. Otherwise looks good to me.
Author: Arjun Mandair Date:
CAD Review 3:
Hey Justin Liu , Please take a look at the feedback Alison provided in the confluence documentation. After this, and seeking another confirmation from Alison, you may:
Create the DXF Files
Edit the main assembly with your design
There is also one other thing I should mention (apologies for not doing this earlier). We have received dimensions for the servo gearbox as well. Please ensure your servo mount adheres to these dimensions (Note these dimensions are in inches). You may have to edit the C:\WARG_CAD\COMP2024\Antenna Tracker\Yaw-And-Pitch Antenna Tracker\ANTENNA_TRACKER_02_SERVO_GEARBOX Assembly to do this. Great work so far! We're almost complete!
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Author Justin Liu Date
Editing the Main Assembly
Based on dimensions Arjun provided, the servo gearbox container was modified (updated dimensions) to fit the new aluminium bend mounts.
There are ambiguous dimensions in the manufacturer’s dimensions; the figure below shows uses “(GUESSED)” to indicate the unknown dimensions which can be changed later.
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Due to the slight changes in dimensions, the mount is made slightly wider (from 35 mm to 40 mm wide) to adapt the increase of horizonal distance between left and right (AKA the 1.061 inch).
Side note: The countersink holes position on the baseplate are constrained to the aluminium bend mounts.
Drawing of the plate with countersink holes and DXF of the new bend mounts are created, located under:
C:\WARG_CAD\COMP2024\Antenna Tracker\Yaw-And-Pitch Antenna Tracker\Drawings and DXFs
Files are called:
ANTENNA_TRACKER_SERVO_MOUNT_01_BASEPLATE.SLDDRW
ANTENNA_TRACKER_SERVO_MOUNT_01_BASEPLATE.PDF
Flat pattern - ANTENNA_TRACKER_SERVO_MOUNT_03_STAND_EDIT.DXF
Only one DXF was created because the mirror of the mount is the same as bending the plat layout to the opposite side.
replaced the old mounts in main assembly with new ones:
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Author: Arjun Mandair Date
Servo Backholder Redesign for Waterjet:
Hey Alison Thompson,
I modified to be compatible with waterjet. Utilized 1/2in alum 6061 plate. Not too sure about the fillets. Any thoughts or concerns? You can check out in C:\WARG_CAD\COMP2024\Antenna Tracker\Yaw-And-Pitch Antenna Tracker\ANTENNA_TRACKER_00_MAIN_ASSEMBLY.
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Author: Alison Thompson Date
CAD Review:
I think the thickness of the stock can probably be brought back from 1/2” to 3/8” and the thickness of the profile can be knocked down to 1/8”. Maybe could make the fillets smaller but that doesn’t matter much, good job not putting fillets in the corners that interact with the servo. I’d also suggest you double check with the machinist on tolerancing for the waterjet so you’re sure the servo will fit in irl incase the part comes out oversized.
Author: Arjun Mandair Date
Servo Backholder Redesign Decrease in Thickness and Profile:
Hey Alison Thompson, the following changes have been made:
Changed thickness of the stock from 1/2in - 3/8in
Brought down profile to 1/8in
Wasn’t asked to do so, but I changed the M5 bolt from the backholder mount to the baseplate to M4. Please let me know if I should change this!
Double checked Justin Liu's changed in the gearbox dimensions. Seems good to me!
Rebuilt broken sub-assemblies. Fixed!
Spacing for servo gearbox = 34mm (gearbox thickness) + 0.01in (total) (aka +0.005in on each side)
I also spoke to machinist, and the waterjet is +-0.005 (which is why I increased servo cutout spacing to 0.01in total). Once approved I will order the sheet metal and screws.
Nathan and I also discussed and tested. We can confirm that all gearbox components utilize 6-32 Screws! Unfortunately, Servocity discontinued these products, so documentation is unreachable. This include the following:
Servo Gearbox
Spacer
Clamp
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Author: Arjun Mandair Date:
Servo Mount CAD Review 4:
Hey Justin Liu , after today’s WARG Mechanical meeting 2024-03-19 Mechanical Meeting Minutes, we discussed the following improvements for your drawings:
Dimension the hole callout for the countersinks. Ensure they follow GD&T standards
Include a section view of for the drawing. In my opinion, the section view would look best if you section the first countersinks you see from the front (included drawing below to clarify this)
Isometric view is not needed, so please remove it
Again, great work so far! We are currently awaiting Alison Thompson approval for next steps! Thanks for the help! Preferably, please try to get this done by @ 12:00am.
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Author Justin Liu Date
Updated drawing, created pdf placed in the same folder as previous drawing, pdf file is named ANTENNA_TRACKER_SERVO_MOUNT_01_BASEPLATE_REV2.pdf
Not quite sure how this base plate will be manufactured, if it is going on a CNC then I don’t know if any dimensions of hole locations are needed.
View file | ||
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Author: Alison Thompson Date:
For Arjun Mandair 's changes:
“Wasn’t asked to do so, but I changed the M5 bolt from the backholder mount to the baseplate to M4. Please let me know if I should change this!” Unless there is a reason it need to be M4 due to COTS components (which I don’t think is the case), according to CAD guidelines, all WARG parts/assemblies should use M5 or M3 bolts only
If you made both of the thickness changes and adjusted tolerances as discussed, should be good. PDM is broken for me atm but I’m happy to approve the manufacturing of the “servo backholder” if those are the only changes
For Justin Liu 's drawing:
Overall looks good, a few notes:
I would move both dimensions of your detail view to the same side of the part
Make the thickness of the material a reference dimension because it’s not changing but is useful
Your section view scale looks to be the same scale as your main drawing but is labelled as a different scale
You don’t need the material thickness as a note if you have it dimensioned, if you would like it to be clearer that it’s 1/8th in you can edit the properties of the thickness dimension to have 3 decimal places for the imperial dimension (message in discord about fixing drawing template so you don’t have dual dimensions everywhere, but per the CAD guidelines we use them on dimensions where the imperial dimension is useful, which it is here)
Author Justin Liu Date
I’ve updated the baseplate drawing using the new WARG template
Revision 3: knowing this part is being manufactured using waterjet, I removed dimensions for hole locations.
The drawing template doesn't seem to update the model scale automatically when I change it, so I edited the scale in the title block manually.
I also created the drawing for the mount, it’s basically a copy how the previous mount drawing looks like.
This file is located in C:\WARG_CAD\COMP2024\Antenna Tracker\Yaw-And-Pitch Antenna Tracker\Drawings and DXFs
drawing named: ANTENNA_TRACKER_SERVO_MOUNT_03_STAND_EDIT.SLDDRW
pdf named: ANTENNA_TRACKER_SERVO_MOUNT_03_.pdf
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Author: Arjun Mandair Date:
Servo Mount CAD Review 5 and Rollback Issues:
Hey Justin Liu ,
There seems to be some rollback issues with the Antenna Tracker Main Assembly C:\WARG_CAD\COMP2024\Antenna Tracker\Yaw-And-Pitch Antenna Tracker\ANTENNA_TRACKER_00_MAIN_ASSEMBLY.SLDASM. I don't know if the issues occurred from me checking the assembly out, or you checking the assembly in. Tbh this makes no sense to me whatsoever. Essentially, I need you to fix the assembly, as my PDM is not working. Every time I make changes, they do not push correctly. There are a couple of things I need you to do.
Ensure there are no external references. I noticed you used external references when creating the countersink holes, however, I recently learned that we should not be using them.
Ensure the assembly is fully defined. I noticed that after you checked in the main assembly, and made your changes, the assembly was no longer fully defined.
Ensure you rebuild the assembly prior to checking in changes. This messed up the assembly when I checked it out, so ensure you rebuild, save, then checkin.
I also noticed that you made a subassembly to check your dimensioning for the servo mounts ("C:\WARG_CAD\COMP2024\Antenna Tracker\Yaw-And-Pitch Antenna Tracker\ANTENNA_TRACKER_06_SERVO_MOUNT\ANTENNA_TRACKER_SERVO_MOUNT_STABLEIZATION_MOD_08MAR2024\ANTENNA_TRACKER_SERVO_MOUNT_00_ASSEMBLY.SLDASM") please use this subassembly in the main assembly, and not the individual parts. You will notice that the cutout for the M6 Bolts are missing. Again, I do not understand why this happened.
We lost some progress, and you will notice that some of your sheet metal changes are gone. It's unfortunate, and I don't understand why that happened. You will notice some of the holes that we removed are now back, which is annoying. Luckily, the sheet metal was cause prior to any of this happening, so I can continue building this moving forward. Going to Alison Thompson about this as well so she's informed. Please let me know if you have any questions.
Author Justin Liu Date
Hey Arjun,
I think I am the root cause of all this assembly issue. In short, I did not properly modify the big main assembly in my first attempt, which lead to all this chaos.
Specifically, in my first attempt to modify the Big Main Assembly:
I did not use the my baseplate file in the ANNEN......STABLEIZATION_08MAR2024 folder but instead I just created external reference holes on the base plate that's already in the big Main Assembly.
I created the screw cut out on the bend mounts using external references which then caused the location shifting issue earlier.
I did not change the file name for my baseplate file in the ANNEN......STABLEIZATION_08MAR2024 folder which lead to confusion because there were two baseplate files with the same name but in different folders.
I used an external variable that's in the Big Main Assembly to dimension the servo container and bend mount which may have broken mates causing the big main assembly to become not fully constrained.
Really Sorry for all of this. Here's the changes I made this time:
I deleted all external reference I had and replaced with with a number dimension.
I renamed all the files in the ANNEN......STABLEIZATION_08MAR2024 so there are no repeating file names.
I remade the servo mount sub-assembly.
I created a copy of the Big Main Assembly and replaced the servo mount parts with the servo mount sub-assembly. (I created a copy because I'm afraid of breaking the original Main Assembly even more. But I made sure no error pops up after I rebuild the assembly this time.)
I also went back to the original Big Main Assembly, re-mated the servo mount parts and made sure it's fully constrained.
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There were some issues with using SolidWorks toolbox screws. Every time I close the servo mount sub-assembly, it prompts me to save this one specific screw I used.
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Conall Kingshottsaid toolbox screws are local files, which won’t work; pull a screw model off McMaster-Carr. So after mating a screw model from McMaster-Carr to the servo mount sub-assembly and rebuilding the Copy of Big Main Assembly, I deleted the original Big Main Assembly with permission from Arjun.
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